Press



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Patented Nov. 8, 1927 units le t r? V enonen ALLEn snn'LEY, or rnvmeron, NEW annsny; ess'ienon rowns'rnnn ELEC- 'rnro COMPANY, YORK.

rnconronernnor new YORK, N. Y.', A oonr'oBA'rIoN .01 HEW.

rnnss.

Application filed April 30, 1927. Serial No 1 87;997 Y This invention relates to presses, and more particularly 'to guards for metal extruding presses i It is-an object of this invention to provide a guard for a press whichis effective from the standpoint of protection and does not embodiment of the invention a guard is provided whic-h may be placed around the plunger at'the beginning of the extruding operation and upon a predetermined relative movement between the plunger and cylinder the guard is automatically removed to ZL'POSllllOIl where it will not interfere with the further movement of these parts.

it is believed that a complete understanding of the invention may be had by Mater-- ence to thefollowing description taken in conjunction with the accompanying draw-- ing, illustrating one embodiment of the invention and in which Fig. 1 is a front elevation ofan extruding press provided with a protective guard; Fig. 2 is a fragmentary view thereof showing the guard in another position re moved from the plunger, and

Fig. 3 is a fragmentary plan sectional view taken on the line 3-3 of Fig. 1. 7

Referring to the drawings in which the same reference characters represent similar parts in the several views, the invention is illustrated as embodied in a lead or lead alloy extruding press of the type commonly used in covering cables for use in telephone communicating systems.

The frame of the machine consists of columns 5 which support a beam 6 upon which a plunger 7 of the press is mounted. A cylinder 8 is carried upon a ram 9 by means of which the cylinder may be raised or lowered by a suitable hydraulic pressure system (not shown). In order to fill the cylinder with molten lead or alloy the cylinder'is lowered until the plunger is removed therefrom and the molten metal. is then poured into the cylinder until the cylinder is slightly overflowed with the upper surface of the surplus projecting'slightly above columns ,5.

the top of the cylinder; *This'is done til-"in 1 sure that there will be no air between the lead and the, plunger which might cause i blisters in the extruded cable covering. Before the metal is extruded it is cooled underpressure andthe' cylinder is'therefore raised to bring the plunger into pressing engage-- ment with the top surface of the metal. 1f the cylinder is raised too. quickly before the plunger-enters the cylinder the molten 'in-' terior of the metal may tend to' burst through the solidified exterior shell-itherejof and project hotmetal in the'vicinity'of th press and endanger the workmen; After the metal has beencooled under pressurea sufficient length of time, it may; be safely extruded'jn the usual manner through'an opening 10 around a cable 11 Q In order to'protect the workmen against I this danger, a pair of semi-circular guarding' members 12 are provided, each supported by an arm 'ld pivoted atj15 'in'anarni support 16'which is attached to one of the The opposite i end of the arm 14 is provided with a counterweight 18 to balance the weight of theguard member- 12.- Then a charge ofmolten" metal has been placed in the cylinder-"8 the guard members are placed by' the operator-in the; 2

positions shown in full linesin'Fig; 1. As the cylinder is raised it will raise the guards and finally engage the arms l l'raising the guard members 12' until the posi ions shown in dotted lines in Fig. 1 are reached, when the counterweights 18' will overbalance the weight thereof-and move them into the position shown in Fig. 2 where they will not interfere with the further movement of the cylinder. to prevent the guard members 12 from striking the columns 5, each arm 14 is provided with a pin 19 which travels around the circular end portion of the arm support 16 until it reaches the end of the are when it will engage the fiat upper surface of the arm and prevent further movement of the guard member. The balanced eflect obtained by the use ofv the counterweights 18 is also of advantage in restraining the movement of the guard members 12 toward the cylinder head sothat when the guard is placed in position by the operator the guard members will not strike the cylinder to mar the cylinder head or the guard mem In order 2 hers. By properly adjusting the positions of the guard supports 16 upon the columns 5 the movements of the guard members may be properly timed to afford the desired prodrawing the guard from the path'of the movable parts upon a predetermined relative movement between the parts.

2. In a press having a relatively movable cylinder and plunger, a guard support stationary withrespect to oneoit said members,

aguard member carried by an arm pivoted in said support, and means for removing the guard member from its guarding'position upon a predetermined movement between the cylinder and the plunger.

'3, In an extruding press having a relatively movable cylinder and plunger, a guard support stationary with respect to one of said members, an arm pivoted on said support, a guard member secured to one end of the arm and a weight secured to the other end of said arm, said weight being so positionedwith respect to the guard member that when the guard member is raised a predetermined distance it will be overbalanced bythe weight.

4. In an extruding press having a rel atively movable cylinder and plunger, a guard support stationary with respect to one of said members, a guard member carried by an arm pivoted in said support, means for removing the guard member from its guardmg positlon upona predetermlned movement between the cylinder and the plunger, and

means for limiting the movement of the guard member.

5. In an extruding press having a rel-' atively 'movable cylinder and plunger, a guard support stationary with respect to one of said members, a guard member carried by an arm pivoted in said support, means for removing the guard member from its guarding position upon a predetermined movement between the cylinder and the plunger, and a pin in the arm carrying the guard adapted to engage the support to limit its movement.

6. In an extrudlng press havlng arelatively movable cylinder and plunger, 1 a

pair of semi-circular guard members for surrounding the plunger at the beginning of an extruding operation, means for p1vot-:

ally supporting. the guard members] at opposite sides of the press, and means for moving the guards about their pivot and away from the plunger upon a predetermined relative movement between the cylin-' der and plunger. 7

7. In an extruding press having a. relatively movable cylinder and plunger, a

guard for limiting the escape of material from the press, and means controlled by a relative movement of the cylinder and pl'un'- ger for limiting the period of effectiveness of the guard. p I v 8. In anextruding press havlng a relatively movable cylinder and plunger, a

guard for limiting the escape ofmaterial from the press, and means responsive to a relatlve movement between the cyhnderand plunger for removing the guard from its operative position.

In witness whereof, I hereunto subscribe my name this 20th day of April A. 1)., 1927.

GEORGE ALLEN SEELEY. 

